JP2889840B2 - Construction method of underground outer peripheral wall - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground outer peripheral wall.

[0002]

2. Description of the Related Art Generally, construction of an underground outer peripheral wall is performed according to the following steps. Construction of scaffolding along mountain retaining wall Setup of sepa for ink sink and formwork Reinforcement of wall reinforcement along mountain retaining wall Replacement of scaffolding Press-fitting of column reinforcement, hoop winding and reinforcement of indoor side wall formwork Installation of gantry Incorporation of single-sided formwork Reinforcement of beam reinforcement, construction of beam formwork

[0003]

As described above, the conventional method of constructing an underground outer peripheral wall has not only a very large number of steps but also the work of forming a form, arranging a reinforcing bar and the like on a scaffold or a form gantry. Work, the workability and safety are very poor,
There was a problem that the construction period was delayed and the cost was high.

[0004] The present invention has been made in view of such problems, and has as its object to reduce the number of work steps to improve workability and safety, and to shorten the construction period of an underground outer peripheral wall. It is to provide a construction method.

[0005]

The present invention for solving the above-mentioned problem is a method of constructing an underground outer peripheral wall using a mountain retaining wall formed underground, wherein the method comprises the steps of: Build a mesh bar unit and arrange wall bars,
On the front side of this wall reinforcement, precast concrete columns protruding from one side with hoop reinforcements tied to the main reinforcement were erected at appropriate intervals, and a reinforcing steel frame was provided between the precast concrete columns in the longitudinal direction of one side. A precast concrete wall plate is erected and fixed to the column, a beam form is assembled and formed between the column caps, and an inner form formed by the beam form, the precast concrete column, and the precast concrete wall plate. And placing the concrete between the retaining wall and the retaining wall, and the scaffold bracket is detachably attached to the reinforcing steel frame of the precast concrete wall plate.

[0006]

According to the above construction, since the inner formwork is formed by the precast concrete pillar, the precast concrete wall plate and the beam formwork, the process of assembling the inner formwork can be largely omitted. In addition, since there is no work on the scaffold or the formwork gantry, safe work can be performed.

In addition, when the precast concrete wall plate is erected, it is possible to prevent the precast concrete wall plate from being distorted when the precast concrete wall plate is suspended by the reinforcing steel frame provided on one side in the longitudinal direction, thereby preventing cracks and the like. .

Since the scaffolding bracket is detachably attached to the reinforcing steel frame of the precast concrete wall plate, a simple scaffold can be obtained by hanging the scaffolding plate over the scaffolding bracket.

Since the scaffolding bracket is detachably attached to the reinforcing steel frame, the scaffolding formed by the scaffolding bracket can be easily changed, and a separator is not required.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method of constructing an underground outer peripheral wall will be described below in detail with reference to the drawings. 1 is a side view of a precast concrete column (hereinafter simply referred to as a PC column), FIG. 2 is a bottom view thereof, FIG. 3 is a cross-sectional view of a precast concrete wall plate (hereinafter simply referred to as a PC wall plate), and FIG. FIG.

The method of constructing an underground outer peripheral wall according to the present invention is performed by combining a PC column 1 and a PC wall plate 10 as shown in FIGS.

The PC column 1 is a so-called half PC, in which a part of a column main bar 3 protrudes from the upper surface of a concrete body 2 having a U-shaped cross section, and a part of a hoop bar 4 protrudes from one of the side surfaces. The pillar main bar 3 is connected to the projected hoop bar 4.

A cotter 5 is provided on the inner surface of the concrete body 2, and an upper portion of the truss bar 6 is projected along the longitudinal direction of the inner surface. Further, an insertion hole 7 for inserting the column main bar 3 is provided on the bottom surface, and a sleeve joint 8 having the same function as this is provided at the lower end of the column main bar 3. An entrance 9 through which a person can enter and exit is formed on a side surface of the hoop 4.

The PC wall plate 10 is formed by projecting the upper portion of the truss bar 6 from one surface of the concrete plate 11 along the length direction, and a reinforcing steel frame is mounted along the length direction on the surface opposite to the protrusion surface. Holes 11a are provided at appropriate intervals.

Hereinafter, the PC column 1 and the PC wall plate 10 will be described.
The method of constructing the underground outer peripheral wall using the method will be described. First, as shown in FIG. 5, a mesh bar unit formed by connecting vertical and horizontal bars in a lattice shape is erected along the retaining wall 12, and a wall bar 13 is arranged.

Next, an angle 15 is attached around the column 14 projecting in front of the wall 13. Then, the PC column 1 is suspended in this angle 15 and the column
4 is inserted into the insertion hole 7 and the sleeve joint 8.

At this time, the PC column 1 is positioned by the column bar 14 and the angle 15, but is temporarily fixed by attaching a distortion preventing wire (not shown) or a vibration preventing angle (not shown).

Next, the PC is inserted through the entrance 9 on the side of the hoop 4.
A mortar is injected into the insertion hole 7 and the sleeve joint 8 of the concrete body 2 after a person enters the pillar 1 and cured for at least one day. After this curing, the angle 15 is removed, and the reinforcing bar 16 is arranged around the PC column 1.

Next, the PC wall plate 10 is installed.
Before that, two reinforcing steel frames 17 are attached to one side of the concrete plate 11. This attachment is performed by screwing the bolt 17a of the reinforcing steel frame 17 into the attachment hole 11a of the concrete plate 11.

Next, the PC to which the reinforcing steel frame 17 is attached
The wall plate 10 is lifted and built between the PC columns 1. The reinforcing steel frame 17 resists lateral pressure when concrete is poured into the PC wallboard 10 and prevents distortion when the PC wallboard 10 is lifted.

The PC wall plate 10 thus built between the PC columns 1 is fixed to the PC columns 1 with the fixing brackets 18, and the lower end of the reinforcing steel frame 17 is fixed to the concrete floor with the fixing brackets 18.

When the first PC wall plate 10 is completely installed, the PC column 1 is fixed to the retaining wall 1 by the fixed anchor 19.
2 (not shown), concrete is poured to the top of the PC wall plate 10, and the reinforcing steel frame 17 is removed.

Next, in the same manner as described above, the PC wall plate 10 to which the reinforcing steel frame 17 is attached is lifted, and is built on the lower PC wall plate 10 already built. The reinforcing steel frame 1
Numeral 7 protrudes downward from the lower end of the concrete plate 11 to reinforce the joint, and also serves as a guide when building.

Next, the upper PC wall plate 10 is fixed to the PC column 1 and the lower PC wall plate 10 with fixing fittings 18, and the upper part is fixed to the retaining wall 12 with fixing anchors 19.

Then, as shown in FIG.
A beam form 20 is assembled on the wallboard 10 in a conventional manner. An inner formwork 21 is formed by the beam formwork 20, the PC column 1 and the PC wall plate 10, and the inner formwork 21 and the retaining wall 12 are formed.
The underground outer peripheral wall 25 is constructed by placing concrete between them.

FIG. 15 shows a scaffolding bracket 22 provided on the reinforcing steel frame 17 of each PC wall plate 10.
The scaffold 24 is formed by bridging the scaffold plate 23 around 2. Since this scaffold bracket 22 is provided detachably, it can be formed on the upper part as the PC wall plate 10 is erected, and the rearrangement can be easily performed.

[0027]

According to the present invention, since the inner formwork is formed by the PC pillar, the PC wall plate and the beam formwork, the assembling process of the inner formwork can be largely omitted, and the scaffold and the formwork gantry can be used. Since the operation of (1) is eliminated, the safety of the operation can be achieved.

[0028] The reinforcing steel frame 17 resists the lateral pressure when the concrete is poured into the PC wallboard 10, and the PC
By preventing distortion when the wall plate 10 is lifted, cracking and breakage are prevented.

Since the scaffolding bracket is detachably attached to the reinforcing steel frame of the precast concrete wall plate, a simple scaffold can be obtained by hanging the scaffolding plate over the scaffolding bracket.

Since the scaffold bracket is detachably attached to the reinforcing steel frame, the scaffold formed by the scaffold bracket can be easily changed.

Since the conventional separator is not required, there is no water leakage from the mounting portion of the separator.

[Brief description of the drawings]

FIG. 1 is a side view of a PC column.

FIG. 2 is a bottom view of a PC column.

FIG. 3 is a sectional view of a PC wall plate.

FIG. 4 is a bottom view of the PC wall plate.

FIG. 5 is a sectional view in which an angle is attached around a column bar.

FIG. 6 is a sectional view in which a PC column is erected.

FIG. 7 is a sectional view in which a PC column is erected.

FIG. 8 is a sectional view in which a PC wall plate is erected between PC columns.

FIG. 9 is a front view in which a lower PC wall plate is erected between PC columns.

FIGS. 10 (1), (2), and (3) are cross-sectional views of main parts for attachment.

FIG. 11 is a front view in which an upper PC wall plate is erected between PC columns.

FIG. 12 is a cross-sectional view of a main part of the attachment.

FIG. 13 is a sectional view of the inner mold.

FIG. 14 is a sectional view of an underground outer peripheral wall formed by casting concrete.

FIG. 15 is a sectional view in which a scaffold bracket is attached to a reinforcing steel frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PC column 2 Concrete body 3 Pillar main bar 4 Hoop bar 5 Cotta 6 Truss bar 7 Insertion hole 8 Sleeve joint 9 Doorway 10 PC wall plate 11 Concrete plate 12 Mountain retaining wall 13 Wall bar 14 Column bar 15 Angle 16 Steel bar 17 Reinforcement steel 18 Fixed Hardware 19 Fixed anchor 20 Beam formwork 21 Inner formwork 22 Bracket for scaffolding 23 Scaffolding board 24 Scaffolding 25 Underground outer peripheral wall

Continuation of the front page (56) References JP-A-7-62647 (JP, A) JP-A-6-10363 (JP, A) JP-A-62-153437 (JP, A) JP-A-2-115419 (JP, A) JP-A-47-30113 (JP, A) JP-A-5-77321 (JP, U) JP-A-4-63753 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB Name) E02D 29/045 E21D 13/00

Claims (2)

(57) [Claims] 1. A method of constructing an underground outer peripheral wall using a retaining wall formed underground, comprising arranging a mesh reinforcement along the retaining wall, arranging a wall reinforcement, and arranging the reinforcement. On the front side, precast concrete pillars with hoop reinforcements with main bars protruding from one side are erected at appropriate intervals, and between these precast concrete pillars, a precast concrete wall plate with a reinforcing steel frame in the length direction of one side Is fixed to the column, a beam form is assembled and formed between the column heads, and an inner form formed by the beam form, the precast concrete column and the precast concrete wall plate, and the mountain retaining wall. A method of constructing an underground outer peripheral wall, comprising placing concrete between the underground wall. 2. The method according to claim 1, wherein a scaffold bracket is detachably attached to a reinforcing steel frame of the precast concrete wall plate.